java设计模式--组合

    public abstract void add(Component c);  

    public abstract void remove(Component c);  

    public abstract void eachChild();  
}  

// 组合部件类  
public class Leaf extends Component {  

    // 叶子节点不具备添加的能力，所以不实现  
    @Override  
    public void add(Component c) {  
        // TODO Auto-generated method stub  
        System.out.println("");  
    }  

    // 叶子节点不具备添加的能力必然也不能删除  
    @Override  
    public void remove(Component c) {  
        // TODO Auto-generated method stub  
        System.out.println("");  
    }  

    // 叶子节点没有子节点所以显示自己的执行结果  
    @Override  
    public void eachChild() {  
        // TODO Auto-generated method stub  
        System.out.println(name + "执行了");  
    }  

}  

// 组合类  
public class Composite extends Component {  

    // 用来保存节点的子节点  
    List<Component> list = new ArrayList<Component>();  

    // 添加节点 添加部件  
    @Override  
    public void add(Component c) {  
        // TODO Auto-generated method stub  
        list.add(c);  
    }  

    // 删除节点 删除部件  
    @Override  
    public void remove(Component c) {  
        // TODO Auto-generated method stub  
        list.remove(c);  
    }  

    // 遍历子节点  
    @Override  
    public void eachChild() {  
        // TODO Auto-generated method stub  
        System.out.println(name + "执行了");  
        for (Component c : list) {  
            c.eachChild();  
        }  
    }  
}  

public static void main(String[] args) {  
    ComponentDemo demo = new ComponentDemo();  
    // 构造根节点  
    Composite rootComposite = demo.new Composite();  
    rootComposite.name = "根节点";  

    // 左节点  
    Composite compositeLeft = demo.new Composite();  
    compositeLeft.name = "左节点";  

    // 构建右节点，添加两个叶子几点，也就是子部件  
    Composite compositeRight = demo.new Composite();  
    compositeRight.name = "右节点";  
    Leaf leaf1 = demo.new Leaf();  
    leaf1.name = "右-子节点1";  
    Leaf leaf2 = demo.new Leaf();  
    leaf2.name = "右-子节点2";  
    compositeRight.add(leaf1);  
    compositeRight.add(leaf2);  

    // 左右节点加入 根节点  
    rootComposite.add(compositeRight);  
    rootComposite.add(compositeLeft);  
    // 遍历组合部件  
    rootComposite.eachChild();  
}